Anti-diabetic agents and heart health: how to use new diabetes medications in a global strategy for the prevention of cardiovascular complications in type 2 diabetes

Anti-diabetic agents and heart health: how to use new diabetes medications in a global strategy for the prevention of cardiovascular complications in type 2 diabetes

Carmine Gazzaruso1,2, Adriana Coppola1, Tiziana Montalcini3, Colomba Falcone2,4

1Diabetes and endocrine and metabolic diseases Unit and the Centre for Applied Clinical Research (Ce.R.C.A.) Clinical Institute “Beato Matteo” (Hospital Group San Donato), Vigevano, Italy; 2Interdepartmental Center for Research in Molecular Medicine (CIRMC), University of Pavia, Pavia, Italy; 3Department of Clinical and Experimental Medicine, Nutrition Unit, University Magna Grecia, Catanzaro, Italy; 4Department of Cardiology, Istituti Clinici di Pavia e Vigevano, University Hospital, Pavia, Italy

Correspondence to: Carmine Gazzaruso, MD, PhD. Diabetes and endocrine and metabolic diseases Unit and the Centre for Applied Clinical Research (Ce.R.C.A.) Clinical Institute “Beato Matteo”, Corso Pavia, 84, 27029 Vigevano, Italy. Email:

Provenance: This is an invited Editorial commissioned by Section Editor Qi-Nan Wu, MD, PhD (Associate Professor of Endocrinology Department, South West Hospital, Third Military Medical University, Diabetic Foot Diagnosis & Treatment Medical Center of Chong Qing, Chong Qing, China), and Guest Section Editor Xiaotian Lei [The First Hospital Affiliated to Army Medical University (Southwest Hospital), Chongqing, China].

Comment on: Pagidipati NJ, Navar AM, Pieper KS, et al. Secondary Prevention of Cardiovascular Disease in Patients With Type 2 Diabetes Mellitus: International Insights From the TECOS Trial (Trial Evaluating Cardiovascular Outcomes With Sitagliptin). Circulation 2017;136:1193-203.

Submitted Mar 06, 2018. Accepted for publication Mar 13, 2018.

doi: 10.21037/atm.2018.03.30

Type 2 diabetes mellitus is a powerful cardiovascular (CV) risk factor (1). Diabetic patients have a 2 to 4 times increased CV risk and about 80% of them die from CV disease (CVD) (1-3). This elevated CV risk is in part due to hyperglycemia but is mainly caused by the features of the metabolic syndrome, such as insulin-resistance, lipid disorders, obesity, hypertension, hyperuricemia (1,3). In fact, several studies showed that hyperglycemia may be a weak CV risk factor (4,5) and that an intensive glycemic control may even increase CV mortality (4,5) if hypoglycemia occurs (6). In addition to CVD, heart failure (HF) represents an important cause of increased morbidity and mortality in people with diabetes, as it is more prevalent in these subjects than in the general population (1). HF in diabetes is caused both by coronary artery disease (CAD) and by a specific heart disease called diabetic cardiomyopathy (1). An increased CV morbidity and mortality in diabetes may be also due to the fact that vascular complications are often asymptomatic and thus untreated (7,8). Therefore, new screening strategies and new predictors for asymptomatic CAD and peripheral artery disease (PAD) have been proposed (8-11). In addition, there may be an increased global CV morbidity and mortality due to diabetes, as diabetes is growing in pandemic proportions (2). Today it affects about 425 million subjects worldwide, but this number is projected to increase more than 628 million by 2045 (12). In other words, about 12% population will have diabetes.

CV prevention in diabetes

The reduction of CV morbidity and mortality in diabetes can be obtained not only by the treatment of hyperglycemia but also by the control of all associated CV risk factors. Therefore, diabetes drugs should ideally act with positive effects both on the glycemia and on the factors of the metabolic syndrome. In addition, it is important to use glucose-lowering medications with established CV safety. This need arose especially when in 2007 rosiglitazone was accused of increasing the risk for myocardial infarction and death (13).

CV safety and efficacy of new diabetes medications

After the rosiglitazone saga, Food and Drug Administration (FDA) and European Medicine Agency (EMA) required new glucose-lowering medications to demonstrate CV safety, resulting in specific clinical trials, called CV Outcomes Trials (CVOTs). The primary composite outcome of the CVOTs on new diabetes medications comprised similar elements, namely the following major adverse cardiovascular events (MACE): CV death, nonfatal myocardial infarction and nonfatal stroke. There may be differences in secondary endpoints among the CVOTs. CVTOs regarded three new classes of diabetes drugs: dipeptidyl peptidase IV (DPP-IV) inhibitors or gliptins, Glucagon-like peptide-1 (GLP-1) receptors agonists (GLP-1 Ras) or incretin-mimetics, and sodium-glucose cotransporter-2 (SGLT-2) inhibitors. Since issuing this new guidance, a lot of major CVOTs have been completed until now and for some of them the results have been positively surprising. Table 1 summarizes all completed CVOTs regarding new glucose-lowering medications.

Table 1
Table 1 CVOTs regarding new classes of glucose-lowering medications completed from 2008 until now
Full table

These trials have unexpectedly shown that some of these new medications can give CV benefits independently of their action on glycemic control. In addition, they have shown favorable effects on several CV risk factors associated to diabetes.

A statistically significant reduction in CV risk was first observed in the Empagliflozin, CV Outcomes, and Mortality in Type 2 Diabetes (EMPA-REG OUTCOME) trial that randomized more than 7,000 diabetic patients with vascular complications to receive the SGLT-2 inhibitor empagliflozin or placebo. After a 3.1-year period, patients receiving empagliflozin had a 14% reduction in the primary composite outcome, a 38% reduction in CV death, and a 35% reduction in HF hospitalizations (14). Interestingly, empagliflozin showed a reduction in weight, waist circumference, systolic and diastolic blood pressure, and acid uric levels with respect to placebo. To understand whether positive effects on CV risk and on risk factors other than glycemia may be due to the whole class of SGLT2 inhibitors data from trials and real-world studies are accumulating.

The Canagliflozin Cardiovascular Assessment Study (CANVAS) program comprised two sister trials (CANVAS and CANVAS-R) that was designed to evaluate CV safety and efficacy of canagliflozin. The authors included more than 10,000 diabetic people with vascular complications or at high CV risk. Patients taking canagliflozin had a 14% reduction in the primary composite outcome and a 33% reduction in HF hospitalizations (15). However, in this trial a statistically significant doubling incidence of amputations was documented in the canagliflozin group; this higher incidence of amputations may be due to a personal history of amputation or PAD at baseline.

Interestingly, a large real-world study compared three approved SGLT-2 inhibitors (empagliflozin, canagliflozin and dapagliflozin) versus other diabetes drugs in over 300,000 patients from six countries. In diabetic patients free of CVD at baseline SGLT-2 inhibitors were able to lower the risk of death by 51% and of HF hospitalizations by 39% (16).

Taken together, all these data clearly suggest that CV protection due to SGLT-2 inhibitors is independent of glucose-lowering and is not fully explained by the reduction in associated CV risk factors. Therefore, additional mechanisms have been hypothesized (17).

After the EMPA-REG OUTCOME trial, another CVOT showing CV benefits due to a new diabetes medication was published: the Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results (LEADER) trial (18). It investigated liraglutide that belongs to GLP-1 RAs. More than 9,340 diabetic patients at high CV risk were randomized to liraglutide or placebo. After a 3.8-year period, patients under liraglutide had a 13% reduction in the primary composite outcome: this results was especially due to reduction in CV death. Then, another GLP-1 RA, semaglutide, showed important CV benefits (19). The Trial to Evaluate Cardiovascular and Other Long-term Outcomes with Semaglutide in Subjects with Type 2 Diabetes (SUSTAIN-6) trial randomized more than 3,200 diabetic patients with vascular complications, chronic kidney disease or high CV risk due to the presence of additional CV risk factors to semaglutide or placebo. Patients treated with semaglutide had a 26% reduction in the primary outcome, mostly due to the reduction in nonfatal stroke.

The Evaluation of Lixisenatide in Acute Coronary Syndrome (ELIXA) trial explored CV safety of lixisenatide, another GLP-1 RA, and was published before the LEADER study (20). It confirmed CV safety of lixisenatide but did not show any reduction in CV events. In the recent Exenatide Study of Cardiovascular Event Lowering (EXSCEL) trial, the once-weekly GLP-1 RA exenatide showed CV safety, but it was not superior with respect to efficacy, even if the P value was very near to the statistical significance (0.06) (21).

As it is possible to see, CVOTs regarding the class of GLP-1 RAs did not give homogeneous results on CV benefits, but this may be due to differences in the features of people enrolled into the studies. However, it is important to remember that all GLP-1 RAs are associated to weight loss and decrease in blood pressure. A slight increase in heart rate and neutral effects on HF hospitalizations were also documented.

Another new class of glucose-lowering medications tested for CV safety is that of DPP-IV inhibitors. At the moment results from four large CVOTs are available in the literature. In these trials saxagliptin, alogliptin, sitagliptin and omarigliptin showed CV safety, even if a decrease in MACE was not observed (22-25). Nevertheless, two of these trials (Saxagliptin Assessment of Vascular Outcomes Recorded in Patients with Diabetes Mellitus-Thrombolysis in Myocardial Infarction 53 -SAVOR-TIMI 53- and Examination of CV Outcomes with Alogliptin versus Standard of Care -EXAMINE-) suggested that saxagliptin and alogliptin may give a higher risk for HF hospitalizations. In particular SAVOR TIMI 53 showed that patients treated with saxagliptin had 27% higher risk for HF hospitalizations compared to placebo (22). In the EXAMINE trial a higher incidence of HF hospitalizations was not observed in the group of patients taking alogliptin than in placebo group (23). However, among the subjects without a history of HF at baseline the risk for HF hospitalizations was 76% greater in people treated with alogliptin than controls. Reassuring data came from the Trial Evaluating Cardiovascular Outcomes with Sitagliptin (TECOS) trial: indeed patients treated with sitagliptin did not have an increased risk for HF hospitalization (24) and this was confirmed by further analyses (26). The recent trial with omarigliptin showed that no increase in HF hospitalization was observed in subjects talking DPP-IV inhibitors when compared to controls (25).

To better understand the potential risk for HF hospitalization due to DPP-IV inhibitors meta-analyses and retrospective analyses on large databases were exploited. A meta-analysis found that a slight increase in the risk for HF hospitalization in people treated with gliptins (27), but another one with 54 studies did not (28). However, in the latter meta-analysis an increased risk for HF was seen in subjects taking saxagliptin, but not in people treated with other gliptins (28). The Canadian Network for Observational Drug Effect studies retrospectively examined administrative health electronic data of 1,499,650 patients with 29,741 HF hospitalizations. The comparison between gliptins and other diabetes medications did not show any increased risk for HF hospitalization in diabetic patients with or without a history of HF (29). Similar results were obtained by an analysis of a large database made by the FDA (30). The lack of an increased HF risk was observed also in people treated with saxagliptin and alogliptin (30).

On the basis of these data, we can affirm that CV safety of DPP-IV inhibitors in term of MACE occurrence is certain. On the contrary the effect of gliptins on HF risk remains to be definitively elucidated. Data available in the literature suggest that there may be a higher risk for HF, but that this risk is not a class effect. However, FDA recommended discontinuation of saxagliptin or alogliptin if HF occurs, and label for sitagliptin and linagliptin was modified to include a warning that other gliptins may increase the risk for HF hospitalization.

Prevention of CV complications in clinical practice: a global approach

Prevention of CV complications and death in diabetes remains a big problem for the clinicians. Indeed, as recently reviewed by Giugliano, in type 2 diabetes more intensive glycemic control leads to a slight reduction in MACE (about 9%) (4,5). This implies that the vascular residual risk is 91%. Therefore, appropriate strategies should be adopted in daily clinical practice to adequately reduce CV risk. It is well-known that only a global intensive control of all CV risk factors can give a significant reduction of CV events in diabetes (31). Even if this evidence is well-known from many years, a large percentage of diabetic patients do not achieve the goals for CV risk factors both in primary and secondary prevention of CVD (32,33).

A recent large study has evaluated the degree to which secondary prevention goals are met globally in diabetic patients with overt CVD (34). Five parameters have been taken into account: aspirin use, lipid control, blood pressure control, ACE-inhibitors or ARBs use, and non-smoking status. The authors used data from the TECOS trial. They found that among 13,616 diabetic patients and known CVD from 38 countries only 29% of them achieved all 5 secondary prevention parameters at baseline, even if 71.8% achieved at least 4 parameters. There were differences in the degree to which secondary prevention goals were met among world regions and countries. Only 58% of people attained blood pressure control and this was the lowest overall attainment, while non-smoking status was the highest (89%). According to the authors these results have some important clinical implications. Indeed, this study has well documented that diabetic patients with CVD are still being undertreated globally with respect to secondary prevention, in particular with respect to blood pressure control. Therefore, these gaps in care, if filled, can provide important opportunities to greatly improve CV prognosis in very high CV risk patients (34).

To further reduce the risk for CV events in diabetic patients, especially in those with proven CVD, SGLT2 inhibitors and GLP-1 RAs should be used. Both can reduce associated CV risk factors, in particular obesity and hypertension, and the global CV risk independently of other risk factors. In addition, SGLT-2 may be an ideal choice in patients with HF.

When patients have a glycemic control not far from the target DPP-IV inhibitors may represent a good choice, especially if the physician believes that weight excess can be treated with lifestyle modifications alone. This class should be avoided in patients with HF and saxagliptin and alogliptin should be avoided also in patients at risk for HF.

All these new therapeutic options should be always added to metformin that remains the first-line treatment, according to the current guidelines (35). On the other hand, several studies have documented CV safety of metformin and its positive effects on lipid profile, body weight, endothelial function, oxidative stress (36). In addition, metformin is safe and is able to give CV benefits, even in subjects with HF and in older patients (37-39).

It is important to remember that new glucose-lowering medications and metformin share the same characteristic of having a very low risk for hypoglycemia. Indeed, as already reported, hypoglycemia represents a strong CV risk factor (6). In addition, the occurrence of hypoglycemia may explain some neutral or negative results on CV outcomes when intensive glycemic control was obtained with drugs associated to high risk for hypoglycemia, such as sulfonylureas or insulin (4,5,36).

Another important tool to decrease CV morbidity and mortality is to deliver to all the patients a structured patient therapeutic education, as recently suggested by several data (3,40,41). Ongoing trials should elucidate the most effective methods by which patient education can give the best results in terms of CV prevention (42).

At last, it is important outline that 10–30% of diabetic patients may have an asymptomatic CAD (43). Some large randomized studies did not support the idea that a systematic screening for silent CAD may give CV benefits (44,45), even if some studies documented an improvement in CV prognosis (7,46). Therefore, current European Society Cardiology guidelines suggest to better define the real impact that screening for silent CAD may have on the prognosis of the patients (47). Indeed, in patients with silent CAD a more strict control of CV risk factors may be requested on the basis of a secondary prevention strategy, an anti-ischemic therapy may be started and a revascularization may be performed, when appropriate. All these actions may improve the prognosis (7). The screening for asymptomatic PAD may be another important tool to identify and early treat diabetic patients at high CV risk (8).

Table 2 summarizes all the possible preventive measures to minimize the CV risk in people with type 2 diabetes.

Table 2
Table 2 A global strategy for cardiovascular prevention in type 2 diabetes
Full table


Many recent findings have thrown a new light on how to greatly reduce the residual vascular risk in type 2 diabetic patients. It is necessary to obtain a strict glycemic control by using drugs with a low risk for hypoglycemia. In addition, the patients should achieve the goals for all associated CV risk factors and receive a structured patient therapeutic education. Screening for asymptomatic CAD and PAD may help to adopt a secondary prevention strategy and to treat them with appropriate therapies. At last, newer glucose-lowering medications can be very helpful in the treatment of diabetes because of their CV safety, action on associated CV risk factors and very low risk for hypoglycemia. Some of them can even give additional CV benefits that are independent of all the above preventive measures to reduce CV morbidity and mortality.




Conflicts of Interest: The authors have no conflicts of interest to declare.


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Cite this article as: Gazzaruso C, Coppola A, Montalcini T, Falcone C. Anti-diabetic agents and heart health: how to use new diabetes medications in a global strategy for the prevention of cardiovascular complications in type 2 diabetes. Ann Transl Med 2018;6(10):195. doi: 10.21037/atm.2018.03.30